linux-kernel - Re: [PATCH perf/core v5 02/15] perf-buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid

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Date:	Fri, 29 Apr 2016 07:50:24 +0900
From:	Masami Hiramatsu <mhiramat@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	<linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>
Subject: Re: [PATCH perf/core v5 02/15] perf-buildid-cache: Use
 path/to/bin/buildid/elf instead of path/to/bin/buildid

On Thu, 28 Apr 2016 10:22:23 +0900
Namhyung Kim <namhyung@...nel.org> wrote:

> Hi Masami,
> 
> On Thu, Apr 28, 2016 at 03:37:23AM +0900, Masami Hiramatsu wrote:
> > From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> > 
> > Use path/to/bin/buildid/elf instead of path/to/bin/buildid
> > to store corresponding elf binary.
> > This also stores vdso in buildid/vdso, kallsyms in buildid/kallsyms.
> > 
> > Note that the existing caches are not updated until user adds
> > or updates the cache. Anyway, if there is the old style build-id
> > cache it falls back to use it. (IOW, it is backward compatible)
> > 
> > Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> > Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> > ---
> >  Changes in v5:
> >   - Support old style buildid caches.
> > ---
> >  tools/perf/util/build-id.c |   80 ++++++++++++++++++++++++++++++++++----------
> >  tools/perf/util/dso.h      |    5 +++
> >  tools/perf/util/symbol.c   |   15 ++++++--
> >  3 files changed, 76 insertions(+), 24 deletions(-)
> > 
> > diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
> > index b6ecf87..b035483 100644
> > --- a/tools/perf/util/build-id.c
> > +++ b/tools/perf/util/build-id.c
> > @@ -144,7 +144,8 @@ static int asnprintf(char **strp, size_t size, const char *fmt, ...)
> >  	return ret;
> >  }
> >  
> > -static char *build_id__filename(const char *sbuild_id, char *bf, size_t size)
> > +static char *build_id_cache__linkname(const char *sbuild_id, char *bf,
> > +				      size_t size)
> >  {
> >  	char *tmp = bf;
> >  	int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
> > @@ -154,15 +155,45 @@ static char *build_id__filename(const char *sbuild_id, char *bf, size_t size)
> >  	return bf;
> >  }
> >  
> > +static bool __is_regular_file(const char *pathname)
> > +{
> > +	struct stat sb;
> > +	return stat(pathname, &sb) == 0 && S_ISREG(sb.st_mode);
> > +}
> 
> It looks like that the is_regular_file() is already in the
> util/util.c

Nice catch!!
OK, it should be used.

Thanks!

-- 
Masami Hiramatsu <mhiramat@...nel.org>